大家好,小弟對機率很不熟,
http://ppt.cc/R9wV
在我畫的框框為什麼兩者可以相等,
總覺得怪怪的,
框框的地方應為4E(x^2)+12E(x)+9
最後的答案應為0而不是12
高手們有什麼想法?
感謝看完
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